extend-click(x = -8rpx, y=x)
  position relative
  &::after 
    position absolute
    z-index 2
    content ""
    left x 
    right x 
    top y 
    bottom: y 
    margin: auto;
no-wrap()
  text-overflow: ellipsis
  overflow hidden
  white-space nowrap

no-wraps(l = 2) {
  display           : flex;
  display           : -webkit-flex;
  display           : -webkit-box-flex;
  display           : -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: l; //需要控制的文本行数
  overflow          : hidden;
  text-overflow     : ellipsis;
}

extend-after()
  position relative
  &:after 
    position absolute
    display: block
    content ""
    left 0
    right 0
    top 0
    bottom 0
    margin auto